It will not be worth it. Importing a car costs so much money that it is almost always cheaper to just buy a US model. Many of them are not admissable until they reach a certain age.
Somebody on the Lexus forum was trying to import a Canadian Toyota Celsior, the non-US version of the Lexus LS400, and found out that the car could not be imported into the US until it reached 25 years of age.